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x in (-oo:+oo)
Y-3 = (1/2)*x // - (1/2)*x
Y-((1/2)*x)-3 = 0
Y+(-1/2)*x-3 = 0
Y-1/2*x-3 = 0 // - Y-3
-1/2*x = -(Y-3) // : -1/2
x = (-(Y-3))/(-1/2)
x = -2*(3-Y)
x = -2*(3-Y)
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